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QveST [7]
3 years ago
14

List 3 examples of pure substances

Chemistry
2 answers:
ollegr [7]3 years ago
4 0

1. water (H2O) 2. helium (He) 3. iron (Fe)

Brrunno [24]3 years ago
4 0

Table salt, table sugar, and gold.

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When an object is lifted 10 feet off the ground, it gains a certain amount of potential energy. If the same object is lifted 30
Elden [556K]

Answer: 3 times as much the potential energy

Explanation:

Potential energy is the energy possessed by an object by virtue of its position.

P.E=m\times g\times h

m= mass of object

g = acceleration due to gravity

h = height of an object  

When same object with same is lifted from 10 feet to 30 feet. The height has increased 3 times , thus the potential energy will also get 3 times as much.

4 0
3 years ago
An organic chemist plans for the synthesis of a complex organic molecule by
VladimirAG [237]

In order to synthesize a complex organic molecule, the chemist should at least illustrate or imagine the bonds that are in need to be cut down or to separate in order to obtain the compound that can be easily changed.

7 0
3 years ago
Why does a heating curve have horizontal plateaus at certain points during the heating process? What is happening at those point
DENIUS [597]
A <span>heating curve having horizontal plateaus at certain points during the heating process means that the process occurs at increase heating. </span>
4 0
3 years ago
A chlorine atom has a diameter of 175 picometers (pm). Please write the diameter, in metered, in scientific notation.
IrinaVladis [17]
The answer is 1.75 x 10¹⁰ m.
Scientific notation<span> refers to a mathematical expression that is  used to represent a decimal number between 1 and 10 multiplied by ten, or we can say that to write a large numbers using less digits. 
Diameter of chlorine atom = </span><span>175 picometers (pm) 
</span>175 pm = <span>0.000000000175 m
in scientific notation we will write </span>0.000000000175 m as <span>1.75 x 10</span>¹⁰ m
8 0
3 years ago
Solid calcium carbonate decomposes to produce solid calcium oxide and carbon dioxide gas. Express your answer as a chemical equa
Gwar [14]

Answer:

CaCO_3(s)\rightarrow CaO(s)+CO_2(g)

Explanation:

Hello!

In this case, when solid calcium carbonate, CaCO3 (s), is decomposed by the action of thermal energy (heat), solid calcium oxide, CaO (s) and carbon dioxide gas, CO2 (g) are yielded via the following reaction:

CaCO_3\rightarrow CaO+CO_2

However, since calcium carbonate is solid as well as calcium oxide and carbon dioxide is given off as a gas, we write:

CaCO_3(s)\rightarrow CaO(s)+CO_2(g)

Which also balanced.

Best regards!

8 0
3 years ago
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